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cmd/asm: restore supporting of *1 scaling on ARM64

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On ARM64, instruction like "MOVD (R1)(R2*1), R3" is accepted and
assembles correctly with Go 1.16, but errors out on tip with
"arm64 doesn't support scaled register format", since CL 289589.

"MOVD (R1)(R2), R3" is the preferred form. But the *1 form works
before and assembles correctly. Keep supporting it.

Fixes #46766.

Change-Id: I0f7fd71fa87ea698919a936b6c68aa5a91afd486
Reviewed-on: https://go-review.googlesource.com/c/go/+/328229
Trust: Cherry Mui <cherryyz@google.com>
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: eric fang <eric.fang@arm.com>
This commit is contained in:
Cherry Mui 2021-06-15 12:47:57 -04:00
parent 785a8f677f
commit a6a853f94c
2 changed files with 4 additions and 1 deletions
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3
src/cmd/asm/internal/asm/parse.go
View File

@ -1003,7 +1003,8 @@ func (p *Parser) registerIndirect(a *obj.Addr, prefix rune) {
p.errorf("unimplemented two-register form")
}
a.Index = r1
if scale != 0 && p.arch.Family == sys.ARM64 {
if scale != 0 && scale != 1 && p.arch.Family == sys.ARM64 {
// Support (R1)(R2) (no scaling) and (R1)(R2*1).
p.errorf("arm64 doesn't support scaled register format")
} else {
a.Scale = int16(scale)

2
src/cmd/asm/internal/asm/testdata/arm64.s vendored
View File

@ -547,6 +547,7 @@ TEXT foo(SB), DUPOK|NOSPLIT, $-8
// shifted or extended register offset.
MOVD (R2)(R6.SXTW), R4 // 44c866f8
MOVD (R3)(R6), R5 // 656866f8
MOVD (R3)(R6*1), R5 // 656866f8
MOVD (R2)(R6), R4 // 446866f8
MOVWU (R19)(R20<<2), R20 // 747a74b8
MOVD (R2)(R6<<3), R4 // 447866f8
@ -579,6 +580,7 @@ TEXT foo(SB), DUPOK|NOSPLIT, $-8
MOVB R4, (R2)(R6.SXTX) // 44e82638
MOVB R8, (R3)(R9.UXTW) // 68482938
MOVB R10, (R5)(R8) // aa682838
MOVB R10, (R5)(R8*1) // aa682838
MOVH R11, (R2)(R7.SXTW<<1) // 4bd82778
MOVH R5, (R1)(R2<<1) // 25782278
MOVH R7, (R2)(R5.SXTX<<1) // 47f82578